The panel needs several seconds to scan for plugins after you open it. So you need to wait a bit and not click around like crazy.

If it still crashes, your Photoshop installation may have a problem with providing a list of installed plugins to the panel. Not sure if we can do anything about it. Photoshop CS4 still is a bit buggy when it comes to flash panels. It may help to install the CS4 11.0.1 update.

Sorry, Harald, the plugin site panel also crashes PS 11.01 for me! Installed OK (as administrator, Vista Professional 32bit) but when I go to Window>Extensions>PluginSite I see the panel begin to open, and then "Adobe Photoshop has stopped working" and my only option is to close the program. Needless to say, Windows has not yet provided me with any solutions!

Colorwasher and Lightmachine still invaluable even though I have NIK Complete Collection!